Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aa0611faaaa987…

MALICIOUS

PDF

81.7 KB Created: 2021-05-24 14:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c740e748ff65f9eda489944d2b3609f SHA-1: 12b802d04a8b7a4956e642509a3e4528feaae08e SHA-256: 20aa0611faaaa9878706f153018327ff04a194558c3cae158c71b6f6f3a8d083
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=what+are+negative+forms PDF link annotation
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/vuwebifigedakebozeb.pdfIn PDF document text
    • https://xisiwifuroki.weebly.com/uploads/1/3/5/3/135323104/d3560e05ac06948.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/9150462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_605c3b73308c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_606a336c89b8f.pdfIn PDF document text
    • https://vojitimene.weebly.com/uploads/1/3/4/5/134596684/dazazadexirabopapubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_603a7dac69302.pdfIn PDF document text
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/xepurudokibuzinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/89ea4b41-6d0e-49c7-9c7b-1970d59bac8d/casio_g-shock_sports_model_ga110-1aos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1918264d-e438-4e7a-a7cc-648e39a8d0a1/examples_of_recursive_functions_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef448895-7eca-4fd1-bf0c-201ee0823b27/fixovimonutumajeruguvotos.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/92576017718.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/post_scarcity_anarchism.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/imagenes_de_los_medios_de_comunicacion_antiguos_y_modernos.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/vuzisodilef.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/sigamos_bailando_song_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176d42dc-c0dc-485f-9663-2374472099a1/journey_to_the_centre_of_the_earth_book_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa05dcc-ae2b-43ed-a0df-e237727d145b/28534750520.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/scribus_tutorial_video.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/al_quran_al_karim_word_by_word_translation_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31b8ad4-87a3-4790-9307-ce2f2ffd22dd/no-no_boy_john_okada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca503124-6bda-4810-92b4-7c951b64e3f6/26859769545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1969a4f-aa8a-48b2-8f7e-e73ddb6b21df/74483451829.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 5012 bytes
SHA-256: 1355deef23e07561247bb5292e2dfb268d3dcce7a96f54332f818de7be5aa7b0
font_01_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 11036 bytes
SHA-256: f548791f25af7bb7847578e6b70cf94ec5d7cd91cd2403c019af940d6bceb3df
font_02_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e